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Finding the Fourth Proportional to 7,385.50, 11,078.25 and 1,913.50

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Solution

The fourth proportional to 7,385.50, 11,078.25 and 1,913.50 is: 2,870.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,385.50 : 11,078.25 = 1,913.50 : x
  2. Step 2: Convert to fraction form
    7,385.50/11,078.25 = 1,913.50/x
  3. Step 3: Cross multiply
    7,385.50x = 11,078.25 × 1,913.50
  4. Step 4: Simplify right side
    7,385.50x = 21,198,231.38
  5. Step 5: Solve for x
    x = 21,198,231.38/7,385.50
  6. Step 6: Final answer
    x = 2,870.25

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.